Object转Map和Map转Object(对象转map，map转对象)

全栈程序员-站长 • 2022年4月28日下午7:20 • 未分类 • 阅读 434

大家好，又见面了，我是你们的朋友全栈君。

FindArchiveDto findArchiveDto = new FindArchiveDto();
findArchiveDto.setContractStatus("降龙");
findArchiveDto.setCustName("明华");
findArchiveDto.setDepartmentName("赵无极");

fastjson转换方法

//Object转Map
Map map = JSONObject.parseObject(JSONObject.toJSONString(findArchiveDto), Map.class);
Map<String,Object> map = JSONObject.parseObject(JSON.toJSONString(findArchiveDto));
//Map转Object
FindArchiveDto findArchiveDto1 = JSON.parseObject(JSON.toJSONString(map), FindArchiveDto.class);
FindArchiveDto findArchiveDto2 = JSONObject.toJavaObject(JSON.toJSONString(map), FindArchiveDto.class);

jackson的转换

ObjectMapper mapper = new ObjectMapper();
//对象转map
Map m = mapper.readValue(mapper.writeValueAsString(findArchiveDto), Map.class);
//map转对象
FindArchiveDto dto = mapper.readValue(mapper.writeValueAsString(m), FindArchiveDto.class);

还可以用org.apache.commons.beanutils.BeanMap进行转换

Map<String, Object> map = new org.apache.commons.beanutils.BeanMap(findArchiveDto);

还可以用org.apache.commons.beanutils.BeanUtils将map转为对象

BeanUtils.populate(findArchiveDto, map);

//Object转Map
public static Map<String, Object> getObjectToMap(Object obj) throws IllegalAccessException {
    Map<String, Object> map = new LinkedHashMap<String, Object>();
    Class<?> clazz = obj.getClass();
    System.out.println(clazz);
    for (Field field : clazz.getDeclaredFields()) {
        field.setAccessible(true);
        String fieldName = field.getName();
        Object value = field.get(obj);
        if (value == null){
            value = "";
        }
        map.put(fieldName, value);
    }
    return map;
}

//Map转Object
public static Object mapToObject(Map<Object, Object> map, Class<?> beanClass) throws Exception {
    if (map == null)
        return null;
    Object obj = beanClass.newInstance();
    Field[] fields = obj.getClass().getDeclaredFields();
    for (Field field : fields) {
        int mod = field.getModifiers();
        if (Modifier.isStatic(mod) || Modifier.isFinal(mod)) {
            continue;
        }
        field.setAccessible(true);
        if (map.containsKey(field.getName())) {
            field.set(obj, map.get(field.getName()));
        }
    }
    return obj;
}

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